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Most manuals record the 400 at 570 lbs. It negated to say if that was with accessories or not. However, does anyone have a weight for a 400 with an aluminum intake,iron heads, starter, alternator, waterpump, and crank pulley?
Look at the Weight Compare 1 tab, and see the actual 6007 assembly weight info. It is as yet unclear what a 6007 assembly entails exactly, but if you look through the other tabs you can get an idea. It does include flexplate, exhaust manifolds, carb, accessories. Anyway, take that basic figure (596), and subtract for all your mods.